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on TED sra'rn'l s PATE' omnes. lHENRY A.' wise woon, lor new :rome N.Y., AssIeNoR 'ro woon Nnwsrnrnn MACHINERY conrom'rron, or New You, N.Y., A conronarmn or vm- FOLDING-normas.

substance for application seria1'1ro.,773,919,a1a :une 16,1913. Thisappncation mea January :'11, 1919. Serial No. 274,219.

To all whom. t may. concern Be it known that LfHENRY A. WISE Voon,g'itudinal fiutin a citizen of theUnited States, residing at New York,in the county of New York and State of New' York, have invented new, and

useful,Folding-Rollers, of which' the following is a specification.

This case is substituted for my applicationl 4toprovide means wherebythe folding rolls of a rotary folding mechanism. can grip `the sheet tobe folded without pressing. it between two metallic surfaces, wherebythe smearing of the interior sheets will be avoided and yet the rollscan secure a good grip on the sheets. The invention involvesimprovements in the construction of .the rolls.

Reference is to be had tothe accompanying drawings in which;

Figure 1 is an end view of a foldingcylin` der with folding rollstherefor constructed in accordance with this invention;

Fig. 2 is a plan of one of these rolls;

Fig. 3 is a sectional View of a portion of the rolls on the line 3 3 ofFig. 1 on enlarged scale; and

Fig. 4 is a transverse sectional view of the same.

As is well known, folding rolls usually employed cause a great deal ofsm-ut because they have to fbite hard on a sheet t o hold it and thusthey press its freshly inked 1nter1or surfaces together. This'frequently causes one sheet to smear the other. This has been a point ofconsiderable difficultybecause the sheets must be given a good grip toprevent their slipping haci( and to cause them to bc delivered rgciact.'time with the mechanism. Yet if the sheets are pressed hard at anypoint except at the margins the smearing above mentioned is likely tooccur.

This invention is shown as applied in connection with a folding cylinder10 having the usual folding blade 11. In order to overcome theabove'mentioned difficulties, the two folding rollers 12 and 13 areprovided with surface flutings.

In the form shown the surfacesof the 'two rollers 12 and 13 are'provided with lonutings 15. of rows of teeth 16, the outer surfacesl ofwhich lie in a cylindrical surface. two rolls are so set up that theprojections or teeth of one register with the indentations f Patentedoet-.- 7, 1919:

14 and. :circumferential l. Thisresults'm the formation or depressionsof the'other, as indicate/din Figs. 1, 3 and 4:. In this wayit will beseen that-the sheet isalways supported between two points or lines onone side and.

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engaged substantially midway between'them by a tooth'or projection onthe other side. Thos the `sheet is gripped with suflicieiit- -firmuessto cause it 'to be passed throu h the rolls accurately and properly andto'l def' posited in thedelivery belts (not shown).`

squarely and accurately. Yet at no oint isV the sheet gripped betweentwo meta lic surfares. 4Consequently the offset and smut aresubstantially avoided.

'Although I have illustrated and described only'one form oftheinvention,.I am aware'. of the fact that xriodlficationscan be made Atherein andthat' the projections and depressions can be arranged in manforms on the surfaces of the rolls 'without eparting from the scope 'ofthe invention as expressed in the claims.

Therefore, I. do not wish to be limtediin 8o these respects, but what Ido claim is 1. VThe combination in a-foldin' mechanism, of afpair offolding rolls having their cylindrical surfaces provided -wi'thlongitudinal and circumferential grooves, thus providing rows of squarefiat-topped projee.

tions, said rolls being arranged to have the projections 4of each oneregister with grooves of the other. 2. In a folding mechanism, thecombmation of a pair of folding rolls having their cylindrical surfacesprovided with crossing grooves, whereby a plurality of' rows offlattopped projections are provided, said rolls being arranged so thatthe pro'yeetmns of each one register with. the grooves of -the` otl ier.

affixed my signature.

In testimony whereof I have 'hereunto

